东濮凹陷石炭—二叠系煤系烃源岩的生烃演化  

Hydrocarbon-generation evolution of the Permo-Carboniferous coal measure in Dongpu Depression

作　　者：朱炎铭[1] 王晓辉[1] 张聪[1] 袁伟[1] 蔡超[1] 陈尚斌[1] 

机构地区：[1]中国矿业大学资源与地球科学学院,江苏徐州221008

出　　处：《石油学报》2007年第6期27-31,共5页Acta Petrolei Sinica

基　　金：国土资源部国家油气专项(XQ200403-03)部分成果

摘　　要：东濮凹陷的石炭—二叠系煤系烃源岩主要分布在本溪组、太原组及山西组,厚度大,分布较稳定,其岩性主要包括暗色泥岩(含碳质泥岩)和煤岩。石炭—二叠系煤系烃源岩自沉积以来,遭受了海西—印支期、燕山期、喜马拉雅期等多期复杂的构造变动,经历了不均一的抬升、变形、埋藏,甚至岩浆作用,导致了烃源岩生烃演化的不连续性和分阶段性。在区域构造作用控制下,东濮凹陷石炭—二叠系经历了海西—印支期、喜马拉雅早期和喜马拉雅晚期等多期复杂的构造—埋藏作用过程,其中最大埋深发生在喜马拉雅早期(东营期末),当时研究区煤系的埋深已达4 300m。在此过程中,有机质的受热温度呈"脉动状"变化,最高受热温度达260℃,导致煤系有机质成熟度呈阶段性增加,并引发多次成烃演化过程。早喜马拉雅期的晚期,相对生烃量大,是煤系主要成烃期,成烃强度最大的区域位于凹陷的前梨园和南部的马厂一带。热解实验分析表明,其煤系有机质最大相对生烃量为300mg/g。但受东营运动的影响,该期部分煤系生烃可能被破坏,导致成藏条件的复杂化。The Permo-Carboniferous coal measure source rocks were distributed in Benxi Formation, Taiyuan Formation and Shanxi Formation in Dongpu Depression and characterized by big thickness and stable distribution. The Permo-Carboniferous system experienced the multiphase complicated tectonic alteration in the Hercynian-Indosinian epoch, Yanshan and Ximalaya epochs. The most buried depth of coal measure in the early Ximalaya epoch was 4300 meters. The thermal temperature of organic matters changed in the pulse pattern with the highest temperature of 260℃. Hydrocarbon-generation evolution of Permo-Carboniferous source rocks revealed discontinuity and grading, which resulted in the multi-phase hydrocarbon-generation evolution. In the late stage of the early Ximalaya epoch, the amount of hydrocarbon-generation was greater. The greatest strength of hydrocarbon-generation occurred in the Qianliyuan and Machang areas of Dongpu Depression. The pyrolysis analysis showed that the most relative hydrocarbon-generation amount of organic matters in coal measure was 300 mg/g. But part of coal measure hydrocarbon-generation may be destroyed under the influence of Dongying movement, which resulted in the complicated conditions for reservoir formation.

关 键 词：东濮凹陷 石炭-二叠系龋系 烃源岩 构造-埋藏史 成熟度 成烃演化 

分 类 号：TE112.11[石油与天然气工程—油气勘探]